Respirator.



W. P BREWSTER.

Patented Jan. 14, 1913.

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W. P. BREWSTER.

RESPIRATOR.

APPLICATION FILED rmme, 1912.

1,050,? 18. Patented Jan. 14, 1913.

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v mj?fiwewaz em tion, especially UNITED STATES PATENT oFFIo-E.

WILLIA'M P. nnnws'rnn, or s'r. Louis, mssounnnssmnon or ONE-HALF TOHARRY A. ursnaw, or say Loursnrssoulu.

'nnsrma'ron.

Specification of Letters Patent.

Application filed February 26, 1912. .Serial No. 679,846.

To all whom. it may concern:

Be it known that I-, W1LI.iAM- P. BREW- s'rnn, a citizen of the UnitedStates, and resident of St. Louis, Missouri, haveinvented certain newand useful Improvements in Respirators, of which the following is a Theobject of my inventionis to provide.

an improved respirator which is adapted to be temporarily attached tothe'head of the user over the mouth and nos e, with the parts arrangedin such a manner that the absorbent or medicated filtering material willonly be exposed to air drawn from the exterior of the respirator andcannot be contaminated by the exhaled air.

A fu-rther object of my invention 'is to provide such a respirator withan improved construction of fresh air tube, where by fresh air from theexterior of the house may be drawn into the respirator through the saidtube and through the medicated absorbent material within the respiratorand thence pass into the lungs of the user, and.

then exhaled through a special exhaling valve, without contaminating themedicated absorbent material.

A further object of myinvention is to provide a respirator of improvedconstrucdiseases of the lungs.

In the drawings Figure 1 is a perspective view of my improved respiratorin practical use upon a patient lying in bed adjacent a window; Fig. 2is a front elevation of my respirator with the absorbent-materialchamber detached in order to show the in-- haling passages and inhalingvalve; Fig; 3 is a sectional side elevation of the respirator; Fig. 4 isa front elevation of a fresh air strainer. applied to the outer end ofthe fresh air tube; Fig. 5 is a sectional side elevationl of the freshair strainer; Fig. 6-is a detail perspective view of a valve seat madeuse of in carrying out my invention; and

Fig. 7 is a sectional side elevation of a detachable absorbent-materialchamber, which may beinterchangeably applied to the resadapted for usein treating Patented Jan. 14, 1913.

pirator' in lieu of the absorbent-1material chamber to which the innerend of the fresh air tube is connected.-

The numeral l-indicates the body of the respirator, which issubstantially coneshaped, but the base margin 2 of which is shaped inthe arc of a circle as shown at the right hand side of F ig; 3; At theopposite side of the body 1 is an integral hollow nosebridge 3, whichtogether with the marginal edge 2 of the body is shaped to anatomicallyfit the use-rs nose and face at points adjacent his mouth.

At the outer end of the conical body 1 is the inhaling valve chamber 4the outer end of which is screw threaded'to fit corresponding screwthreads 5 formed upon the absorbent-material chamber 6 which isdetachably connected to said inhaling valve chamber 4.- Mounted withinsaid valve chamber 4 is the inhaling valve seat 7 having a series ofperforations 8 and detachably clamped in position within said valvechamber by the absorbent-material chamber 6 when the latter is screwedinto position. Fixed upon the inner face of said valve seat 7 andadapted to normally closethe perforations 8 of said valve seat, is aflexible inhaling valve 9, preferably made of mica or other flexiblematerial. Said inhaling valve 9 is supported upon its seat by means of ascrew or rivet 10, so that when inhalations take place the valve willopen inwardly as indicated by dotted lines in Fig. 3.

In the treatment of diseases of the airpassages of the head,-thr0at andlungs, I locate within the absorbent-material chamber 6 a sponge orother body of absorbent or filtermg material as indicated by the numeralll.

12 indicates a flexible fresh air tube which has its inner end securedto one of the absorbent-material chambers, as shown in Fig.

3, while the other, end, is, during use to be passed out through anopening 13 i'nthe window sash 14,35 shown in Fig. 1, to per mit freshair to be drawn into the respirator, in treating lung diseases. Locatedupon the outer end of the said fresh air tube 12 is a. strainer 15,which may be of any preferred construction.

In using the fresh air tube 12 the absorbv cut-material chamber to whichthe inner end of said tube is' attached, is screwed into position uponthe respirator; but when the inhaled air is taken from the room in whichthe valve-seat 7 is removably clamped.

the user is located, the said fresh air tube and its absorbent-materialchamber, are replaced by an interchangeable absorbent-material chamberwhich is shown in Fig. 7, the same having a series of inlet perforations16 in its outer end.

17 indicates an exhaling valve chamber, the interior of which is incommunication wit-h the interior of the body 1 by means of an opening18. The outer end of said exhaling valve chamber is screw threaded toreceive the screw threads 19 of the screw cap 20. The inhaling-valvechamber a and the absorbent-material chamber 6, are (as will be seen)constructed with annular enlargements at the meeting ends of each;thereby forming opposite annular shoulders, or seats, separated by aspace within which It will thus be seen that said valve-seat is clampedbetween said opposite annularshoulders within the said annularenlargements. The said screw cap 20 clamps in position the exhalingvalve seat 21 provided with a series of perforations 22 normally closedby an eXhaling valve 23. The construction of the said exhaling' valve ispreferably identicalwith said inhaling valve 10 previously described,except that the exhaling valve opens outwardly while the inhaling valveopens inwardly.

The numeral 24 indicates strap loops to which the straps 25 areattached, in temporarily securing the respirator in position upon theuser, as shown in Fig. 1.

In use the sponge llis properly saturated with a medicated liquid, andplaced within the absorbent-material chamber, so that all air enteringthe interior of the respirator must necessarily pass through the saidsponge. When the user inhales the air will vented from, coming incontact with the medicated sponge or other material located in theabsorbent-material chamber, by the automatic closing of the inhalingvalve 9, so that said exhalations must pass outwardly through theopenings 22 of the exhaling valve seat 21. Likewise, when inhalationsare made by the user the said exhaling valve 23 will automatically closeand prevent the entrance of air otherwise than through the saidabsorbent-material chamber.

The valves 9 and 23 are preferably made of mica, because I havediscovered that this material has certain advantages not possessed byany other material known to me, as it is flexible, moisture-proof andtransparent, besides possessing other advantages which need not berecited.

hold during the operation of uniting and.

separating said parts, while they are being prepared for use.

I claim:

The improved respirator, comprising a hollow body shaped to fit theusers face, :1

valve-chamber and an absorbent-material chamber having mating telescopicannular enlargements screw-threaded together at the front end of saidbody and forming a handhold on the exterior of said parts, and havinginternal opposite annular shoulders and a corresponding annular spacewithin said chambers, a perforated valve-seat carryin an inhaling-valveand removably clampe in said annular space of said enlargements betweensaid opposite shoulders, and a suitable exhaling-valve also connected tosaid body. y

In testimony whereof, I have signed my name to this specification, inpresence of two subscribing witnesses. I

WILLIAM P. BREWSTER.

Witnesses:

JOHN C. HIcDoN, E. L. WALLACE.

